how to create on an efficient way zeros in a symbolic matrix?

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Koen
Koen 2014-11-12
评论： Sulaymon Eshkabilov 2021-9-30
hey,
I want to create a matrix/array A with size(n,2) (for arbitrary n) such that
A(:,1) = zeros(n,1)
A([1:n-1],2) = 0;
A(n,2) = x (with x a symbolic, in matlab written as 'sym x' )
How do I do it on a efficient way?

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MA
MA 2014-11-12
编辑：MA 2014-11-12
syms x
n=4;
A=sym(zeros(n,2));
A(:,1) = zeros(n,1);
A([1:n-1],2) = 0;
A(n,2) = x;
A

更多回答（2 个）

Walter Roberson
Walter Roberson 2021-9-30
A = [zeros(n,2,'sym') ; 0, x];
Sulaymon Eshkabilov
Ran in:
syms x
n=4;
A=sym(zeros(n,2));
% A(:,1) = zeros(n,1); % NOT Necessary
% A([1:n-1],2) = 0; % NOT Necessary
A(n,[1,2]) = x %#OK
A = 

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